[Test] Make timeout.py signal an error when the timeout is hit. #76146
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Print an error message and exit with a non-zero code when we hit the timeout. This makes it clear when a test fails due to a timeout. On Darwin, run
sampleon the target process first, so that the failure includes some information about what the test was doing when the timeout occurred.This also temporarily increases the timeout for the
large_nested_array.swift.gybtest, which hits this new louder timeout in CI, while we investigate.